Type cylinder for rotary presses



Jan. 18,1927. 1,614,801

A. F. OSTERLIND TYPE CYLINDER FOR ROTARY PRESSES Filed lay a 1 11911527?QyZerZzw w, MW 02%? I dummy Patented Jan. 18, 1921.

UNITED ST TES ml FOB ROTARY P338838.

Application filed m e. was. sci-m m. 23,391.

In my co-pending application for atent upon a rotary press, Serial No.735,23 filed September 2nd, 1924, I have described a machine adapted forgeneral or job printing, in which the type cylinders have peripheriesequal or substantially equal to one of the principal dimensions of thesheet to be printed. To ada t such machines for printmg sheets of diering sizes, a number of type cylinders of corresponding sizes areprovided and arranged to be exchanged one for another. Type cylinders ofsmall diameter are necessarily employed in such machines, and thisprecludes the use of electrotypes of the usual thickness of 11/72ds ofan inch. Abrupt bending of such thick plates distorts the surface of thetype to an extent which renders printing therewith impractical. However,I have discovered that the thickness of the'plates may safely be reducedto about .06 of an inch and that such thin plates are adapted to bemounted on cylinders of small diameter, viz, from 2 to 5 inches indiameter.

Obviously, the commonly employed means for securing plates to cylindersor other bases cannot be used upon such thin plates, and the presentinvention relates to improved means for securing printers plates of thetype described in said application, filed September 2nd, 1924, to smallprinting cylinders.

It is the object of this invention to provide novel and efiicient meansfor'securing printers plates, of the thin type used in such machines,upon supporting cylinders. This invention also includes certain novelfeatures of construction, which will be more fully pointed out in thefollowing specification and claims.

Referring to the accompanying drawings, which illustrate the bestform'of my device at present known to me, Figure 1 is a side elevationof my improved type cylinder with the driving pinion in central,vertical section; Fig. 2 is a section taken on the line 22 of Fig. 1;Fig. 3 is 'a fragmentary section taken on the line,33 of Fig. 1; Fig. 4is a fragmentary end view, showing the means for securing the drivepinion on the shaft of the cylinder; Fig; 5 1s a detail of the dog forengaging the shaft and Fig. 6 is a detail, perspective view of an end ofthe bar for engaging the printers plate or electrotype on the cylinder.

In the drawin I have used the numeral 7 to indicate a t in plate of thetype adapted to be mounted on a cylinder 8 of small diameter. A shaft 15rigidly supports the cylinder 8, while a gear 16 is adjustable on saidshaft, being arranged to be driven at a. fixed speed relative to thepaper cuttin mechamsm of a rotary press. This fixed speed ratio is notchanged when cylinders 8 of different sizes are laced in the machine,but the impression cylinder (not shown) is merely moved into peripherialcontact with the type cylinders. The cylinder 8 is formed with alongitudinal oove 9 in its periphery, the sides of whic converge inward.In the bottom of this groove 9 is a series of tapped holes 10 for aseries of screws 11, adapted to secure a longitudinal bar 12 in saidgroove. The screws 11 have countersunk heads formed with depressionsadapted to be engaged by a wrench for turningsaid screws. Extendingtransversely through the 'bar 12, at suitable spaced intervals, is aseries of pins 13, which project at the sides of said bar to engagemargins 14 on the plate 7.

To permit chan 'ng of the angular position of the cylin er 8, relativeto a drive pinion or gear 16 upon an axial shaft 15, I form a hub onsaid gear, which has an inwardl extending groove 17, ad'acent to the sha15, for a dog 18. This og has a. roughened surface 19, adapted to gripthe shaft 15, and a suitable set screw 20 threaded in the hub of thegear 16 is arranged to be turned to press the dog 18 against the shaft15. This set screw 20 is formed with an axial hole, which is squared toreceive a. wrench or key for turning said screw.

In operation, the plate 7 is repared in the usual manner by the electroyte process or otherwise, thus producing under the present practice, aplate of about eleven seventyseconds of an inch thick. This plate isthen reduced to about six hundredths of an inch thick by removing metalfrom the back thereof. The margins 14, of about a quarter of an inch inwidth, consisting of the copper shell of the plate, are left at theadjoining edges thereof. The thin plate thus produced may now be bent toconform to the cylinder 8 by the use of straps placed about the plateand cylinder. Now with the clamping bar 12- removed, the edges ormargins 14 of the plate 7 are bent into the groove 9, as clearly shownin Figure 3, when said bar 12 is relaced and. ressed into thev groove 9.Finall to secure y fasten said bar in place and to raw the plate 7snugly about the cylinder- 8, the screws 11 are inserted and turned tocause the ins 11 to grip the margins 14 and draw t em downward into thegroove 9. ..The shaft 15 is referably formed integral with the cylinersbf the smaller sizes, and said shaft is arranged to be placed inbearings of the .type described in m coending application, above referreto. Finally, to adjust the cylinder 8 and shaft 15, relative to thedrive gear 16 and other parts of the press, said cylinder is rotated tobring the bar 12 along the line where the printed sheet is to be severedand then the set screw 20 is tightened to engage the shaft 15 with thedog 18.

Having described my invention what I claim as new and desire to protectby Letters Patent is:

1. The combination with 'a type cylinder formed with a longitudinalgroove in the eriphery thereof, a type plate adapted to a plied to theperiphery of said cylinder and having a margin adapted to be bent intosaid groove, a bar adapted to be placed longitudinally in said groove,means on a side edge of said bar adated to engage the margin of saidplate an means for securing said bar in engagement with said margin,whereby said plate may be drawn tight about said cylinder and securedagainst rotation thereon.

. 2. The combination witha type cylinder 'formed' with a longitudinalgroove in the riphery thereof, the sides of said groove ing arranged toconverge inward, a type plate adapted to be applied to the periph:

ery of said cylinder and having margins adapted to be bent aga nstverging sides of said groove, said mar being separated one from theother, a at formed tofit in said ve, teeth projecting laterally from.said bar to engage the margins of said plate and means for securgppositee coning said bar in engagement with said marins. I

a 3. Thecombination with a t e cylinder having its periphery substantialy equal to one of the principal dimensions of a shee to be printed, saidcylinder being forme with a longitudinal groovein the periphery thereof,a thin type plate adapted to encircle said cylinder and havin g oppositemargins adapted to be bent into said groove,

a bar extending longitudinall in I said groove, teeth on said baradaipte to enga said margins and means for securingsaid bar inengagement with said margins.

4. The combination with a type cylinder formed with a, longitudinalgroove in the periphery thereof, and a driving .gear arranged in axialalignmentwith said cylinder for driving the same, means for changing theangular position of said cylinder relative to said gear, a, type plateadapted to encircle said cylinder and havin margins adapted to be bentinto'opposite si es of said groove, a bar adapted to be placedlongitudinally in said groove, means on said bar adapted to engage theinwardly bent margins of said plate and means for securing said bar inengagement with saidmargins and cylinder.

In testimony whereof, I have hereunto signed my name to thisspecification,

AUGUST F. OSTERLTND.

